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Calculate token amount minimums for Uniswap Router’s removeLiquidity function

I’m trying to redeem my LP tokens with ethersJS and Uniswap’s Router02 contract. How do I calculate the arguments amountAMin and amountAMin for the function linked below?

https://uniswap.org/docs/v2/smart-contracts/router02/#removeliquidity

Difference of using transfer vs _transfer in OpenZeppelin (same for dash functions)

In openzeppelin contracts in same cases we have 2 types of functions for the same functionality, one of them preceded by a dash symbol (_). That is the case of transfer(x, y, z)/_transfer(x, y, z) function. I am aware that when I want to modify the behaviour if I inherit the function, I should use ::Listen

In openzeppelin contracts in same cases we have 2 types of functions for the same functionality, one of them preceded by a dash symbol (_). That is the case of transfer(x, y, z)/_transfer(x, y, z) function.

I am aware that when I want to modify the behaviour if I inherit the function, I should use _transfer(x, y, z).

But what’s the real difference? Because it happens in lot of functions, and I’m not really sure if I should use transfer(x, y, z) or _transfer(x, y, z).

So then, if I’m not gonna modify its original behaviour, should I use transfer or _transfer?

Thanks in advance